Structured logging (#8673)

* Implementing structured logging

* Changes to en.json to allow refactor to run.

* Fixing global logger

* Structured logger initalization.

* Add caller.

* Do some log redirection.

* Auto refactor

* Cleaning up l4g reference and removing dependancy.

* Removing junk.

* Copyright headers.

* Fixing tests

* Revert "Changes to en.json to allow refactor to run."

This reverts commit fd8249e99bcad0231e6ea65cd77c32aae9a54026.

* Fixing some auto refactor strangeness and typo.

* Making keys more human readable.

app/ldap.go

@@ -4,9 +4,10 @@
 package app
 
 import (
+	"fmt"
 	"net/http"
 
-	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/utils"
 )
@@ -18,7 +19,7 @@ func (a *App) SyncLdap() {
 			if ldapI := a.Ldap; ldapI != nil {
 				ldapI.StartSynchronizeJob(false)
 			} else {
-				l4g.Error("%v", model.NewAppError("SyncLdap", "ent.ldap.disabled.app_error", nil, "", http.StatusNotImplemented).Error())
+				mlog.Error(fmt.Sprintf("%v", model.NewAppError("SyncLdap", "ent.ldap.disabled.app_error", nil, "", http.StatusNotImplemented).Error()))
 			}
 		}
 	})
@@ -68,7 +69,7 @@ func (a *App) SwitchEmailToLdap(email, password, code, ldapId, ldapPassword stri
 
 	a.Go(func() {
 		if err := a.SendSignInChangeEmail(user.Email, "AD/LDAP", user.Locale, a.GetSiteURL()); err != nil {
-			l4g.Error(err.Error())
+			mlog.Error(err.Error())
 		}
 	})
 
@@ -114,7 +115,7 @@ func (a *App) SwitchLdapToEmail(ldapPassword, code, email, newPassword string) (
 
 	a.Go(func() {
 		if err := a.SendSignInChangeEmail(user.Email, T("api.templates.signin_change_email.body.method_email"), user.Locale, a.GetSiteURL()); err != nil {
-			l4g.Error(err.Error())
+			mlog.Error(err.Error())
 		}
 	})